The only thing I found confusing was the definition of 'new' destinations... a route introduced in 2013 doesn't feel particularly 'new' to me.
Otherwise - the wording didn't seem ambiguous - you have to fly to 10 or the 12 listed in the email.
What it doesn't explain is whether you must fly round-trip or if one-way is enough (to combine with an open-jaw or multi-city).